package com.appnet.android.truyencuoi.db;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;

import com.appnet.android.truyencuoi.ComicConstant;
import com.appnet.android.truyencuoi.ItemComic;
import com.appnet.android.truyencuoi.Story;

import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class DataBaseHelper extends SQLiteOpenHelper {

	// The Android's default system path of your application database.
	private static String DB_PATH = "/data/data/com.appnet.android.truyencuoi/databases/";

	private static String DB_NAME = "comic.sqlite";

	private SQLiteDatabase mDataBase;

	private final Context mContext;
	private static int mVersion = 2;

	/**
	 * Constructor Takes and keeps a reference of the passed context in order to
	 * access to the application assets and resources.
	 * 
	 * @param context
	 */
	public DataBaseHelper(Context context) {

		super(context, DB_NAME, null, mVersion);
		this.mContext = context;
	}

	/**
	 * Creates a empty database on the system and rewrites it with your own
	 * database.
	 * */
	public void createDataBase() throws IOException {

		boolean dbExist = checkDataBase();

		if (dbExist) {
			// do nothing - database already exist
			Log.d(ComicConstant.PRE_TAG, "do nothing - database already exist");
		} else {

			// By calling this method and empty database will be created into
			// the default system path
			// of your application so we are gonna be able to overwrite that
			// database with our database.
			this.getReadableDatabase();

			try {
				Log.d(ComicConstant.PRE_TAG, "Copying....");
				copyDataBase();
				Log.d(ComicConstant.PRE_TAG, "Copy finished");

			} catch (IOException e) {

				throw new Error("Error copying database");

			}
		}

	}

	/**
	 * Check if the database already exist to avoid re-copying the file each
	 * time you open the application.
	 * 
	 * @return true if it exists, false if it doesn't
	 */
	private boolean checkDataBase() {

		SQLiteDatabase checkDB = null;

		try {
			String path = DB_PATH + DB_NAME;
			checkDB = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READONLY);

		} catch (SQLiteException e) {

			// database does't exist yet.

		}

		if (checkDB != null) {

			checkDB.close();

		}

		return checkDB != null ? true : false;
	}

	/**
	 * Copies your database from your local assets-folder to the just created
	 * empty database in the system folder, from where it can be accessed and
	 * handled. This is done by transfering bytestream.
	 * */
	private void copyDataBase() throws IOException {

		// Open your local db as the input stream
		InputStream myInput = mContext.getAssets().open(DB_NAME);

		// Path to the just created empty db
		String outFileName = DB_PATH + DB_NAME;

		// Open the empty db as the output stream
		OutputStream myOutput = new FileOutputStream(outFileName);

		// transfer bytes from the inputfile to the outputfile
		byte[] buffer = new byte[1024];
		int length;
		while ((length = myInput.read(buffer)) > 0) {
			myOutput.write(buffer, 0, length);
		}

		// Close the streams
		myOutput.flush();
		myOutput.close();
		myInput.close();
		Log.d(ComicConstant.PRE_TAG, "Coppy success");
	}

	public void openDataBase() throws SQLException {

		// Open the database
		String myPath = DB_PATH + DB_NAME;
		mDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);

	}

	@Override
	public synchronized void close() {

		if (mDataBase != null)
			mDataBase.close();

		super.close();

	}

	@Override
	public void onCreate(SQLiteDatabase db) {
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

	}

	public ArrayList<ItemComic> getItemByCategory(int category) {
		ArrayList<ItemComic> items = new ArrayList<ItemComic>();
		openDataBase();
		String query = "SELECT " + ComicColunms.ID + ", " + ComicColunms.NAME + " FROM " + ComicColunms.TABLE_STORY + " WHERE " + ComicColunms.CATEGORY + " = ?";
		Cursor cursor = mDataBase.rawQuery(query, new String[] { String.valueOf(category) });
		Log.d(ComicConstant.PRE_TAG, "[getItemByCategory] cursor: " + cursor);
		if (cursor != null) {
			while (cursor.moveToNext()) {
				int id = cursor.getInt(cursor.getColumnIndexOrThrow(ComicColunms.ID));
				String name = cursor.getString(cursor.getColumnIndexOrThrow(ComicColunms.NAME));
				Log.d(ComicConstant.PRE_TAG, "[getItemByCategory] id: " + id + " name: " + name);
				ItemComic item = new ItemComic(id, name);
				items.add(item);
			}
			cursor.close();
		}
		close();
		return items;
	}

	public Story getContent(int id) {
		openDataBase();
		Story story = null;
		String query = "SELECT " + ComicColunms.NAME + ", " + ComicColunms.CATEGORY + ", " + ComicColunms.CONTENT + " FROM " + ComicColunms.TABLE_STORY + " WHERE " + ComicColunms.ID + " = ?";
		Cursor cursor = mDataBase.rawQuery(query, new String[] { String.valueOf(id) });
		if (cursor != null) {
			if (cursor.moveToFirst()) {
				String name = cursor.getString(cursor.getColumnIndexOrThrow(ComicColunms.NAME));
				int category = cursor.getInt(cursor.getColumnIndexOrThrow(ComicColunms.CATEGORY));
				String content = cursor.getString(cursor.getColumnIndexOrThrow(ComicColunms.CONTENT));
				story = new Story(id, category, name, content);
			}
			cursor.close();
		}
		close();
		return story;
	}

	public Story getNextContent(int category, int id) {
		Log.d(ComicConstant.PRE_TAG, " category: " + category + " id: " + id);
		openDataBase();
		Story story = null;
		String query = "SELECT " + ComicColunms.NAME + ", " + ComicColunms.ID + ", " + ComicColunms.CONTENT + " FROM " + ComicColunms.TABLE_STORY + " WHERE (" + ComicColunms.ID + " > ? AND " + ComicColunms.CATEGORY + " = ?) ORDER BY id ASC LIMIT 1";
		Cursor cursor = mDataBase.rawQuery(query, new String[] { String.valueOf(id), String.valueOf(category) });
		if (cursor != null) {
			if (cursor.moveToFirst()) {
				int newid = cursor.getInt(cursor.getColumnIndexOrThrow(ComicColunms.ID));
				String name = cursor.getString(cursor.getColumnIndexOrThrow(ComicColunms.NAME));
				String content = cursor.getString(cursor.getColumnIndexOrThrow(ComicColunms.CONTENT));
				story = new Story(newid, category, name, content);
			}
			cursor.close();
		}
		close();
		return story;
	}

	public Story getPreContent(int category, int id) {
		Log.d(ComicConstant.PRE_TAG, " category: " + category + " id: " + id);
		openDataBase();
		Story story = null;
		String query = "SELECT " + ComicColunms.NAME + ", " + ComicColunms.ID + ", " + ComicColunms.CONTENT + " FROM " + ComicColunms.TABLE_STORY + " WHERE (" + ComicColunms.ID + " < ? AND " + ComicColunms.CATEGORY + " = ?) ORDER BY id DESC LIMIT 1";
		Cursor cursor = mDataBase.rawQuery(query, new String[] { String.valueOf(id), String.valueOf(category) });
		if (cursor != null) {
			if (cursor.moveToFirst()) {
				int newid = cursor.getInt(cursor.getColumnIndexOrThrow(ComicColunms.ID));
				String name = cursor.getString(cursor.getColumnIndexOrThrow(ComicColunms.NAME));
				String content = cursor.getString(cursor.getColumnIndexOrThrow(ComicColunms.CONTENT));
				story = new Story(newid, category, name, content);
			}
			cursor.close();
		}
		close();
		return story;
	}

	// Add your public helper methods to access and get content from the
	// database.
	// You could return cursors by doing "return myDataBase.query(....)" so it'd
	// be easy
	// to you to create adapters for your views.

}